Stop 01 · Lot
Size the loan, the draws, and the cash at closing
Start with debt ratio for the permanent mortgage, then estimate interest during construction and cash if the lot is not already owned. Use numbers from your lender.
On the path · Lot
Construction loan calculators
Each calculator has its own page with a plain-English explanation, a worked example from published sources, and answers to common questions. All results are estimates from the numbers you enter, not an offer of credit.
- Construction Loan Calculator (Construction-to-Permanent)Interest on the money drawn during the build, then principal and interest after conversion.
- Land Equity Construction Loan CalculatorSee how far the equity in land you own goes toward the required equity, and how much cash you'd still need.
- How Much Construction Loan Can I Get? CalculatorEstimate your loan amount and cash to close from land, build cost, value, and your lender's limit.
- Construction Loan Draw Schedule CalculatorSet the share of the loan drawn at each stage and see interest build month by month.
- How Long Does It Take to Build a House? Timeline CalculatorAdd up each phase of your build and see what the timeline, and any delay, costs in interest.
- Construction Contingency & Cost Overrun CalculatorTest cost overruns against your contingency and cash reserves.
- Build vs. Buy a House Calculator: Is It Cheaper to Build?Compare the full cost of building, including land, contingency, and interest, against buying.
More tools on this page: debt-ratio loan size, interest during the build, cash at closing, architect fees, and builders risk.
Max construction loan by debt ratio
Your income and your lender’s debt-ratio limit, minus other debts and housing expenses, converted to a loan amount at the rate and term you enter.
Interest during the build
How interest is handled during the build varies by lender. If your lender charges interest on funds already drawn, this estimates one month of it.
Enter a rate from your lender. Results are estimates, not an offer of credit.
Estimated interest this month
Enter your numbers
To see an estimate, enter the loan amount, a rate from your lender, how much has been drawn.
Cash if the lot is not owned
Many one-close programs count owned-lot equity toward the down payment. If land is still being purchased, plan on cash for the down payment your lender requires on the total cost.
Estimated cash in
Enter your numbers
To see an estimate, enter the construction cost, the lot value, the down payment your lender requires.
Architect / designer fee
Percent-of-hard-cost range by scope and complexity.
Builders risk premium
Course-of-construction coverage for the build period.